Difference Between save and saveAndFlush in Spring Java

Save and SaveAndFlush both can be used for saving entities. They both are both belong to the Spring data library. Save may or may not write your changes to the DB straight away. When we call saveAndFlush system is enforcing the synchronization of your model state with the DB.

What is the save method?

The save method is used to store an entity in the database. It adds the entity to the transactional buffer, and when the transaction is committed, the data is saved. It then returns the stored entity.

Example

The following is an example of the save method in Java:

@Repository
public interface UserRepository extends JpaRepository {}

@Service
public class UserService {

    @Autowired
    private UserRepository userRepository;

    public User saveUser(User user) {
        // Save entity to database
        return userRepository.save(user);
    }
}

What is the saveAndFlush method?

The saveAndFlush method is similar to the save method, but it flushes the data during execution and forces the database to write changes to disk before the transaction commits. The data is stored immediately.

Example

The following is an example of saveAndFlush in Java:

@Repository
public interface UserRepository extends JpaRepository {}

@Service
public class UserService {

    @Autowired
    private UserRepository userRepository;

    public User saveAndFlushUser(User user) {
        // Save entity and flush to database immediately
        return userRepository.saveAndFlush(user);
    }
}

Difference between Save and saveAndFlush

The following table shows the difference between Save and saveAndFlush: